I urgently need help. Every 1-2 days my inbox getfilled with 300+ post delivery failure messages. Some electronic marketing goods. Problem is I dont want to create new account as I have built up my contact list over years and sending a new email adress to all feels impossible!
Immediately change your password and security question & answer.
Less likely this is the result of a joe job. If you can post the Hotmail full email headers we'll know fir sure but I believe you are best off changing your passwords and questions.